Questions tagged [high-voltage]

Questions related to the design of circuits that supply or use a high voltage. There are a few definitions but the IEC definition of a high-voltage supply system is above 1000 Vrms AC or 1500 V DC.

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When to use a high voltage resistor vs multiple standard resistors?

Looking for the smallest & most reliable method of dropping 360V down to ~1V for a PMIC feedback pin. Reliability is probably the most important variable here. Question: In general are we be ...
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What determines the voltage rating of a cable?

I'm trying to figure out the maximum voltage of some cables in a vacuum system I've inherited, and I'm confused by the DC voltage ratings given by this supplier as they step from the 3 kV to 10 kV ...
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High Voltage Cascode with MOSFET LT Spice Simulation

I'm an electronics engineering student and want to develop a high voltage switch with normal Si N-MOSFETs. After some research, I discovered cascode switches for this application. Most of these ...
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High voltage power supply polarity for X-ray tube application

High voltage power supplies (HVPS) in the range 100 to 200 kV are used for working with X-ray tube. Some HVPS produce negative output voltage or even bipolar output including negative and positive ...
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Simple, compact 9V DC to 400V DC step up

I'm attempting to create my own Geiger-Muller counter based on an old, soviet STS-5 tube. I want it to be as compact as possible. I don't want to use ready-made modules, like this one, instead I ...
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Enclosure/boxes for high voltage PCB

It is time to choose the proper enclosure for a high voltage PCB. We will need to do holes for LV external connectors and external connectors for high voltage wires. I was looking for standard boxes ...
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How to insulate a high voltage PCB trace?

I am making a PCB with a HV power supply module. Namely the C9619 module from Hamamatsu. The module produces up to 2 mA and 4 W of power so the heat won't be a problem The module can produce up to ...
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2 answers
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Battery powered ionic air pump voltage stepup

I am working on a proof-of-concept device for medical purposes, but am lacking in the electronics side of the skillset! I am trying to build a vibration-free wearable air pump, and using an ionic ...
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What is the name of this huge high-power test equipment?

It seems very old, maybe more than 50 years, and it doesn't have an information plate.
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Electric shock through thick rubber tube filled with coolant and carrying a high voltage wire

I have two Litz wires coming out of a coil. The coil is driven with short pulses of 20 kHz sinosoidal voltage with a peak of 1.4kV. Each Litz wire is insulated by 3 thin layers of mylar sheets in ...
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2 votes
1 answer
110 views

Is this boost converter feedback technique a good idea?

I am in need of a high voltage supply, capable of 15mA at around 200V for a valve/tube preamp. This supply has to be low noise and any switching noise kept out of the audio band. The incoming voltage ...
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How should the clearance calculation be on a coated PCB?

How many mm should the clearance be between the A and B pads in the picture below? And clearance between C pad and D pad? And clearance between E pad and F track? And clearance between F track and G ...
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Electrospray Deposition

I recently got a new project to work on, an Electrospray Deposition setup. Basically, it consists of a needle that contains a liquid, a electrode and a high voltage source. The needle is positioned at ...
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Tektronix P6015 Replacement Potentiometer Considerations

I’ve acquired (saved from the landfill) an old Tektronix high voltage probe, model P6015. The probe body and cable are in decent condition, but I discovered two damaged potentiometers in the ...
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ESD Capacitor Calculation, 330Ohm Series Resistor and ESD Clamp Voltage

I have a input power filter circuit. It has ESD Protection capacitors which help to protect the downstream circuit from ESD Pulses. ESD Capacitors Specifications : C0001, C0002, C0003, C0004 = 47nF, ...
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How can I control the output level from a HV (220VDC) floating regulator using a DAC?

I have a 240V DC supply I want to clean up and make adjustable (150-220V) with an LR8 high voltage floating regulator. I can't use the standard way of connecting the DAC to the adjust pin (current ...
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Fast switch rise time techniques

This question is continuation of this question: High Frequency Square Wave Generator I am trying to drive a 400V supply and 50ohm load with an RF MOSFET which has a rise time of 3-4 ns and fall time ...
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How to ground a flyback transformer?

I designed a 50,000 volt power supply, that I am having problems with on grounding the HV side of the output. The HV appears to be injecting HV into my logic sections through the ground, damaging the ...
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Design considerations for large ratio step-down transformation

What are the design considerations for a system in which a high voltage and current DC soliton pulse (approximately 50kJ at 45kV over 100ms) from a capacitor bank or PFN must be stepped down to a low ...
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Switching n-MOSFET as Solid-State Relay

I'm trying to design a simple solid state relay that can be in the off state when an AC Source is applied (schematic one) and then source up to 150mA to a small resistor when that AC Source is removed ...
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Controlling 120v line with a 12v switch on a different line

I have 10a 120v power sockets in my garage that currently doesn't have any switch on it and powers some overhead lights that I have plugged in. Separate to that, I have a 12v circuit powering various ...
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Rectifying a spark coil that produces 10 kHz

I am working on a project where I want 10 to 30 kV DC (to energize two capacitors in series rated at 28 kV per capacitor). I bought a couple of 25 kV HV rectifiers (one to generate a positive voltage ...
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2 votes
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Cockcroft-Walton Multiplier strange voltage values

I am building a circuit that allows me to generate high DC voltages that can be used in conjunction with a 3He counter tube to detect slow neutron radiation. The circuit was designed by someone else ...
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2 votes
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296 views

Methods for increasing output power and efficiency of a ZVS flyback driver

I have built the following ZVS driver: I am using this circuit at a resonance frequency of 150kHz. My hope is to be able to modify this circuit for wireless power transmission. With that being said, ...
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2 votes
2 answers
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500V generation, MOSFET Heating Problem

Referring to my previous post. I have successfully generated 500V. The problem I am facing an issue. MOSFET I am using for switching is FQB34N20LTM. The MOSFET is burning badly. The snap of drain ...
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1 answer
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Are large pulsed currents the most deadly type of electric shock?

As opposed to sustained electric shock via DC or AC? I might be wrong, but when people are killed by electrocution it is usually due to a large current of very short duration passing through their ...
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Discharging high voltage and capacitance capacitor?

I need to discharge a 4.4mF (millifarads) capacitor storing 1200V in about 5 seconds. I did the t=R*C' and got a resistance value of approximately 227ohms. I did a ...
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Measuring High Voltage DC Using ESP32

I want to read high voltages, around 150VDC, using a ESP32. I plan to put this as an input into the ESP32 ADC pin. But of course, i shouldn't have voltage that high on the input of a ESP32. In ...
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2 votes
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93 views

How to control charge on a high-voltage capacitor after voltage multiplier?

Can anyone think of an electronic way to control the charge on a high-voltage capacitor that is fed by a multi-stage voltage multiplier? I can control the charge on the way up by controlling the ...
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High voltage 1100 V current sense on the high side

I have the circuit that you see below. My load is a photomultiplier tube equivalent to a 3.63Mohm resistor. My power supply can deliver max 4W (2kV and 2mA). I use it on 1100V and the load draws ~...
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55-650V to 5V DC/DC convertor design

For an application I am building I need a custom DC/DC convertor that can convert a voltage ranging from 60V-600V to a contant voltage of around 5V. Using the TI Webench with the paramaters Vin_min = ...
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Spark minimum current

I know from the title may sounds wired. But it makes sense to me at least for my restricted knowledge of high voltages. I'm always working with low or house voltage as well as this question may refer ...
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390 views

High voltage DC offset servo

I'm working on a project and I need some assistance. I have an audio tube amplifier output stage that I need to have adjustable operating points while maintaining a DC null at the output. [![enter ...
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2 votes
1 answer
1k views

High Power H-Bridge with IR2125 Drivers Problem

I'm currently stuck on a problem when trying to drive a 140V DC motor using an H-Bridge with 4 high-power mosfets and 4 IR2125 drivers. I'm using as input to the drivers a signal generator of 5V in ...
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2 votes
1 answer
2k views

MOT Power supply issues

I am working on a quad MOT (microwave oven transformer) tesla coil. We tore apart 5 microwaves and got some MOTs. We first tested each MOT individually. They did not seem to have any problems. We ...
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High voltage (2-6 kV), high frequency (20-50 kHz) power supply how to achive

I need to make a high voltage (2-6 kV), high frequency (20-50 kHz) power supply in order to generate cold plasma (in Ar gas). I use a fly back circuit (found in web) could allow me to to that. The ...
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How many stages can I have on a Marx generator and Cockcroft Walton multiplier?

The Marx generator is powered by DC. So does that mean I can add as many stages as I want? Because on a Cockcroft Walton generator people have been having to use high frequency fly back transformers ...
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1 vote
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HV Rectifier output for APD biasing

I am trying to convert low 5V or 12V to -200V using this device. Which converts it using transformer and rectifier at the output: Can I just attach HV OUT to bias APD detectors? Or is there any ...
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1 vote
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60 views

Help in understanding a Capacitive Voltage Transformer

I have been reading up about CVT’s and trying to comprehend some of the parts of the typical circuit which include: A potential divider (C1 & C2). An inductor tapped from the potential divider. A ...
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1 answer
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Suitable High Voltage source for CRT experiment

I bought a Soviet-era 'new/old stock' Cathode Ray Tube (CRT), historically intended for use in a small oscilloscope. My goal is to explore atomic diffraction (with a hack): But as a chemist/physicist ...
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Protection from high voltage in high frequency ignition in plasma cutting machines

I am currently in the process of designing a circuit for detection of a short circuit of a plasma cutter nozzle with material when there is no arc. The important requirement is that detection ...
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1 vote
1 answer
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How can I get different voltage inputs from a high voltage power supply?

I want to use a 5 kV DC supply to power a low-current (0.5-3.5 mA) circuit in a microfluidic device. I would like to create two input voltages from this power supply to have a 300 V drop from 4.3 kV ...
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1 vote
2 answers
110 views

Relay selection for 48V loads

I want to use a relay to remotely switch a 48VDC 1A load (3A peak on startup with capacitive load), however, nearly all relays I have looked at specify a 30VDC maximum contact voltage. When searching ...
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How to measure the waveform of a piezo igniter?

Is there a (cheap) way to measure the pulse of commercially available piezoelectric igniters like those used in lighters or BBQ grills? I use them as a cheap (and very crude, for sure) method for ESD ...
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1 vote
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Making a unipolar HVPS bipolar safely

I have a Keithley 5kV power supply (2290 model) that I use for high energy physics experiment. It has resolution of 1V and current resolution of 1uA. The range that it offers is +0V to +5000V via its ...
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1 vote
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88 views

Resonant Transformer / Resonant Inductive Coupling

I´m trying to build a resonant transformer (or a resonant inductive coupler, I don´t know if the names fit to the topology I´m showing, anyway). The idea is to develop a high voltage on a capacitor. ...
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2.5 kV Low Frequency Switching Circuit

I am working on designing a circuit to generate and switch a 2.5kV and -2.5kV power supply to generate a high voltage square wave. The intent is to generate an electrostatic field between two ...
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1 vote
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68 views

Low pass filter symmetry

I wanted to know which one of these circuits would be better to protect the transformer. The low pass filters are used as protection to block the high high frequency from the resonant circuit as the ...
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1 vote
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103 views

Howto: RF HV power supply (13,56 MHz, ~30 kV - 50 kV, 1 kW - 3 kW)

I hope you can help me on this one. Short recap about me, I am a maker and I had a vocational education some 30 years ago as engineer in HV (up to 48kV) in industrial facilities. So I am aware of the ...
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1 vote
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145 views

What is the most effective way to prevent electrical arcs across resistors?

When building any kind of ultra high voltage boost circuit or transformer, the high voltage will often arc between components if the voltage is high enough and the distance between them is short ...
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